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Freightliner M2 Business Class Parts

The Freightliner M2 Business Class semi-truck is a solid medium-duty truck that offers the versatility and reliability you'd expect from Freightliner, but we can make you stand out even more by customizing your semi truck with quality parts and chrome accessories from 4 State Trucks. When you drive an M2 Business Class, you'll enjoy top-notch features like maneuverability, roomy interior, and great driver visibility that make it fun and easy to keep your truck on the road. Whether you need bumpers, exhaust, fuel tanks, or any other aftermarket or custom parts for your M2, 4 State Trucks has got you covered - shop our selection of Freightliner parts today.
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  • BESTfit DEF Doser Injector Kit For Cummins Replaces 043027, 2121300003, 321353

    BESTfit DEF Doser Injector Kit For Cummins Replaces 043027, 2121300003, 321353

    BESTFIT TRUCK PARTS

    $131.99
    Diesel Exhaust Fluid Doser Injector Kit By BESTfit Replaces 043027, 2121300003, 321353 Fits CumminsMaintain accurate emissions dosing with the BESTfit DEF Doser Injector Kit, replacing 043027,...
    09-06070002
    SKU:
    09-06070002
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $131.99
    Qty in Cart: 0
    Price:
    $131.99
    Subtotal:
  • BESTfit DEF Doser Injector Kit Replaces 2121300001 For Cummins

    BESTfit DEF Doser Injector Kit Replaces 2121300001 For Cummins

    BESTFIT TRUCK PARTS

    $131.99
    Diesel Exhaust Fluid Doser Injector Kit By BESTfit Fits CumminsDepend on strong emissions system performance with the BESTfit DEF Doser Injector Kit, a replacement for 2121300001. Designed for...
    09-06070003
    SKU:
    09-06070003
    Position:
    Kit Full
    Product Type:
    Fuel Tanks
    Make:
    Universal Items
    $131.99
    Qty in Cart: 0
    Price:
    $131.99
    Subtotal:
  • BESTfit DEF Pump 3.1 For Ford F250 thru F450 6.7L & 150-350HD Transit 3.2L

    BESTfit DEF Pump 3.1 For Ford F250 thru F450 6.7L & 150-350HD Transit 3.2L

    BESTFIT TRUCK PARTS

    $374.99
    Diesel Exhaust Fluid Pump 3.1 By BESTfit Replaces 904369, BC3Z5L227K, BC3Z5J229A Fits Ford F250-F450 6.7 L & 150-350HD Transit 3.2LThe BESTfit DEF Pump 3.1 provides a dependable solution for Ford...
    05-06070000
    SKU:
    05-06070000
    Product Type:
    Fuel Tanks
    Make:
    Ford
    $374.99
    Qty in Cart: 0
    Price:
    $374.99
    Subtotal:
  • BESTfit Plastic Aluminum Radiator 38.5 X 35.75 X 2.1875 Inch 2 Row Replaces 3S0580800003, 37145000, L0437425P For Freightliner

    BESTfit Plastic Aluminum Radiator 38.5 X 35.75 X 2.1875 Inch 2 Row Replaces 3S0580800003, 37145000, L0437425P For Freightliner

    BESTFIT TRUCK PARTS

    $836.99
    Radiator W/ 2.5 Inch Inlet & 2.5 Inch Outlet By BESTfit Replaces 3S0580800003, 37145000, L0437425PMaintain reliable engine cooling performance with the BESTfit Plastic/Aluminum Radiator, a...
    03-07020053
    SKU:
    03-07020053
    Height Options:
    35 1/2 Inch
    Product Type:
    Engine Parts
    Width Options:
    38 1/2 Inch
    Material Options:
    Plastic/Poly
    Make:
    Freightliner
    $836.99
    Qty in Cart: 0
    Price:
    $836.99
    Subtotal:
  • BESTfit Charge Air Cooler Replaces 3E0118500001, 4629661, 44011728 For Freightliner

    BESTfit Charge Air Cooler Replaces 3E0118500001, 4629661, 44011728 For Freightliner

    BESTFIT TRUCK PARTS

    $1,149.99
    Tube And Fin Charge Air Cooler By BESTfit Replaces 3E0118500001, 4629661, 44011728Keep your Freightliner operating efficiently with the BESTfit Charge Air Cooler, designed as a direct replacement for...
    03-07010011
    SKU:
    03-07010011
    Product Type:
    Engine Parts
    Make:
    Freightliner
    $1,149.99
    Qty in Cart: 0
    Price:
    $1,149.99
    Subtotal:
  • BESTfit Air Operated Fan Clutch For Freightliner

    BESTfit Air Operated Fan Clutch For Freightliner

    BESTFIT TRUCK PARTS

    $1,275.99
    Air Operated Fan Clutch By BESTfit Fits FreightlinerThe BESTfit Air Operated Fan Clutch is engineered for durability and performance in Freightliner heavy-duty applications. Featuring air-operated...
    03-07060011
    SKU:
    03-07060011
    Style Options:
    Bolt On
    Type Options:
    Hub Mount
    Product Type:
    Engine Parts
    Make:
    Freightliner
    $1,275.99
    Qty in Cart: 0
    Price:
    $1,275.99
    Subtotal:
  • BESTfit Plastic Aluminum Radiator 38.5 X 42.125 X 2.1875 Inch 2 Rows Replaces 527749003, A0529627019, TR7249P For Freightliner

    BESTfit Plastic Aluminum Radiator 38.5 X 42.125 X 2.1875 Inch 2 Rows Replaces 527749003, A0529627019, TR7249P For Freightliner

    BESTFIT TRUCK PARTS

    $1,185.99
    Radiator W/ 2.5 Inch Inlet & 2.5 Inch Outlet By BESTfit Replaces 527749003, A0529627019, TR7249PKeep your cooling system performing at its best with the BESTfit Plastic/Aluminum Radiator. Replacing...
    03-07020054
    SKU:
    03-07020054
    Height Options:
    42 Inch
    Product Type:
    Engine Parts
    Width Options:
    38 1/2 Inch
    Material Options:
    Plastic/Poly
    Make:
    Freightliner
    $1,185.99
    Qty in Cart: 0
    Price:
    $1,185.99
    Subtotal:
  • BESTfit Plastic Aluminum Radiator 25.125 X 29.75 X 2 Inch 2 Row Replaces 042811, 1102430, VAB1003670 For Freightliner

    BESTfit Plastic Aluminum Radiator 25.125 X 29.75 X 2 Inch 2 Row Replaces 042811, 1102430, VAB1003670 For Freightliner

    BESTFIT TRUCK PARTS

    $851.99
    Radiator W/ 2 Inch Inlet & 2 Inch Outlet By BESTfit Replaces 042811, 1102430, VAB1003670Replace your worn cooling system with the BESTfit Plastic/Aluminum Radiator for Freightliner, engineered for...
    03-07020052
    SKU:
    03-07020052
    Product Type:
    Engine Parts
    Width Options:
    25 Inch
    Height Options:
    29 1/2 Inch
    Make:
    Freightliner
    $851.99
    Qty in Cart: 0
    Price:
    $851.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly For Freightliner Replaces 0431353006, GA202323

    BESTfit DEF Sensor Head Assembly For Freightliner Replaces 0431353006, GA202323

    BESTFIT TRUCK PARTS

    $802.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfit Replaces 0431353006, GA202323 Fits FreightlinerRestore reliable DEF system functionality with the BESTfit DEF Sensor Head Assembly, designed for...
    03-06070005
    SKU:
    03-06070005
    Product Type:
    Fuel Tanks
    Height Options:
    20 Inch
    Make:
    Freightliner
    $802.99
    Qty in Cart: 0
    Price:
    $802.99
    Subtotal:
  • BESTfit Plastic Aluminum Radiator 38.5 X 38.875 X 2.1875 Inch Replaces 527751007, 529619007, A0527745037 For Freightliner

    BESTfit Plastic Aluminum Radiator 38.5 X 38.875 X 2.1875 Inch Replaces 527751007, 529619007, A0527745037 For Freightliner

    BESTFIT TRUCK PARTS

    $1,151.99
    Radiator w/ 2.5 Inch Inlet & 2.5 Inch Outlet By BESTfit Replaces 527751007, 529619007, A0527745037Keep your heavy-duty cooling system operating efficiently with the BESTfit Plastic/Aluminum Radiator,...
    03-07020055
    SKU:
    03-07020055
    Height Options:
    38 Inch
    Width Options:
    38 1/2 Inch
    Product Type:
    Engine Parts
    Make:
    Freightliner
    $1,151.99
    Qty in Cart: 0
    Price:
    $1,151.99
    Subtotal:
  • BESTfit Plastic Aluminum Radiator 35.062 X 38.5 X 2.062 Inch 1 Row Replaces 238848, HDC011230PAFB, TXE1003850D For Freightliner

    BESTfit Plastic Aluminum Radiator 35.062 X 38.5 X 2.062 Inch 1 Row Replaces 238848, HDC011230PAFB, TXE1003850D For Freightliner

    BESTFIT TRUCK PARTS

    $1,121.99
    Radiator W/ 2.5 Inch Inlet & 2.2 Inch Outlet By BESTfit Replaces 238848, HDC011230PAFB, TXE1003850DMaintain reliable engine cooling performance with the BESTfit Plastic/Aluminum Radiator, a...
    03-07020050
    SKU:
    03-07020050
    Product Type:
    Engine Parts
    Material Options:
    Plastic/Poly
    Make:
    Freightliner
    $1,121.99
    Qty in Cart: 0
    Price:
    $1,121.99
    Subtotal:
  • BESTfit Plastic Aluminum Radiator 30.625 X 29.625 X 2 Inch 1 Row Replaces 437238P, 900051, R6366001 For Freightliner

    BESTfit Plastic Aluminum Radiator 30.625 X 29.625 X 2 Inch 1 Row Replaces 437238P, 900051, R6366001 For Freightliner

    BESTFIT TRUCK PARTS

    $984.99
    Radiator W/ 2 Inch Inlet & 2 Inch Outlet By BESTfit Replaces 437238P, 900051, R6366001Replace your worn cooling system with the BESTfit Plastic/Aluminum Radiator for Freightliner, designed for part...
    03-07020051
    SKU:
    03-07020051
    Width Options:
    30 1/2 Inch
    Material Options:
    Plastic/Poly
    Height Options:
    29 1/2 Inch
    Product Type:
    Engine Parts
    Make:
    Freightliner
    $984.99
    Qty in Cart: 0
    Price:
    $984.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly For Freightliner Replaces 0431353004, GA202326, 0435959000

    BESTfit DEF Sensor Head Assembly For Freightliner Replaces 0431353004, GA202326, 0435959000

    BESTFIT TRUCK PARTS

    $765.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfit Replaces 0431353004, GA202326, 0435959000 Fits FreightlinerKeep your Freightliner emissions system operating efficiently with the BESTfit DEF...
    03-06070006
    SKU:
    03-06070006
    Product Type:
    Fuel Tanks
    Height Options:
    20 Inch
    Make:
    Freightliner
    $765.99
    Qty in Cart: 0
    Price:
    $765.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly For Freightliner Replace 0431354004, AP65155, 0431354003

    BESTfit DEF Sensor Head Assembly For Freightliner Replace 0431354004, AP65155, 0431354003

    BESTFIT TRUCK PARTS

    $916.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfit Replace 0431354004, AP65155, 0431354003 Fits FreightlinerRestore accurate DEF system operation with the BESTfit DEF Sensor Head Assembly, designed...
    03-06070004
    SKU:
    03-06070004
    Product Type:
    Fuel Tanks
    Height Options:
    18 Inch
    Make:
    Freightliner
    $916.99
    Qty in Cart: 0
    Price:
    $916.99
    Subtotal:
  • BESTfit DEF Sensor Head Assembly For Freightliner Replaces 2121690001, AP65156, GA202325

    BESTfit DEF Sensor Head Assembly For Freightliner Replaces 2121690001, AP65156, GA202325

    BESTFIT TRUCK PARTS

    $1,031.99
    Diesel Exhaust Fluid Sensor Head Assembly By BESTfit Replaces 2121690001, AP65156, GA202325 Fits FreightlinerEnsure consistent DEF system performance with the BESTfit DEF Sensor Head Assembly for...
    03-06070007
    SKU:
    03-06070007
    Product Type:
    Fuel Tanks
    Height Options:
    20 Inch
    Make:
    Freightliner
    $1,031.99
    Qty in Cart: 0
    Price:
    $1,031.99
    Subtotal:
  • Stage 1 Billet Wheel VGT Turbo Charger W/ Actuator For Paccar MX-13

    Stage 1 Billet Wheel VGT Turbo Charger W/ Actuator For Paccar MX-13

    BULLY DOG

    $5,000.00
    Choose Option(s) to see description.Fitment** Fits Models W/ PACCAR MX-13 Engines 2010-2013Stage 1 Billet Wheel VGT Turbo Charger W/ Actuator Replaces 5355091 For Paccar MX-13Paccar MX-13 Stage 1 VGT...
    PPR_300802
    SKU:
    PPR_300802
    Material Options:
    Billet Aluminum
    Product Type:
    Engine Parts
    Style Options:
    Paccar
    Make:
    Universal Items
    Make:
    Other - Semi-Truck
    $5,000.00
    Qty in Cart: 0
    Price:
    $5,000.00
    Subtotal:
  • Bully Dog Stage 1 Billet Wheel VGT Turbo Charger W/ Actuator For Cummins X15 CM2350 & CM2450

    Bully Dog Stage 1 Billet Wheel VGT Turbo Charger W/ Actuator For Cummins X15 CM2350 & CM2450

    BULLY DOG

    $6,000.00
    Experience more responsive power and improved engine efficiency with this Stage 1 Billet Wheel VGT Turbo Charger with Actuator, designed for Cummins X15 Low or High HP engines and replacing 5459710...
    PPR_300798
    SKU:
    PPR_300798
    Material Options:
    Billet Aluminum
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    Make:
    Other - Semi-Truck
    Make:
    Universal Items
    $6,000.00
    Qty in Cart: 0
    Price:
    $6,000.00
    Subtotal:
  • Limited Quantity Available
    BESTfit A/C O- Ring Kit For Early Or Late Model Applications

    BESTfit A/C O- Ring Kit For Early Or Late Model Applications

    BESTFIT TRUCK PARTS

    $4.99 - $14.99
    Ensure a secure, leak-free seal in your air conditioning system with the BESTfit A/C O-Ring Kit for early or late model applications. This high-quality kit is made from durable EPDM material,...
    PPR_300804
    SKU:
    PPR_300804
    Color:
    Green
    Product Type:
    Engine Parts
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $4.99 - $14.99
    Qty in Cart: 0
    Price:
    $4.99 - $14.99
    Subtotal:
  • Stage 1 Billet Wheel VGT Turbo Charger W/ Actuator For Cummins ISX15, X15 & QSX

    Stage 1 Billet Wheel VGT Turbo Charger W/ Actuator For Cummins ISX15, X15 & QSX

    BULLY DOG

    $4,750.00
    If your goal is smoother boost and reduced turbo lag, this Stage 1 VGT Turbo Charger offers a refined upgrade path. Featuring a billet aluminum compressor wheel and upgraded diffuser plates, the...
    PPR_300797
    SKU:
    PPR_300797
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Material Options:
    Billet Aluminum
    Make:
    Other - Semi-Truck
    Make:
    Universal Items
    $4,750.00
    Qty in Cart: 0
    Price:
    $4,750.00
    Subtotal:
  • Stage 1 Billet Wheel VGT Turbo Charger W/ Actuator For Cummins ISX 871

    Stage 1 Billet Wheel VGT Turbo Charger W/ Actuator For Cummins ISX 871

    BULLY DOG

    $4,750.00
    Maximize torque, efficiency, and reliability with the Stage 1 Billet Wheel VGT Turbo Charger with Actuator, replacing 3774613/2881993/4309078 for Cummins ISX 871 engines. The aluminum billet...
    PPR_300799
    SKU:
    PPR_300799
    Material Options:
    Billet Aluminum
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Other - Semi-Truck
    Make:
    Universal Items
    $4,750.00
    Qty in Cart: 0
    Price:
    $4,750.00
    Subtotal:
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Adding your products to cart

When your Freightliner M2 Business Class is your daily workhorse, you need parts that can keep up. Whether you're hauling, delivering, or running job to job, our aftermarket parts and accessories help your rig stay sharp, strong, and road-ready.

Aftermarket Freightliner M2 Business Accessories

Our aftermarket semi truck parts are reliable, high-quality components—from front bumpers and grilles to lights, mirrors, exhausts, and more. Need engine parts to keep your powertrain smooth? Or custom touches to make your truck stand out? We’ve got it all.

Why Upgrade Your Semi Truck Parts?

- Built for performance: Get durable parts that stand up to heavy-duty jobs. - Boost your style: Chrome accents, lighting upgrades, and custom add-ons. - Fit you can trust: Designed to match the M2’s exact specs for a smooth install. - Versatile options: Perfect for owner-operators, fleets, and vocational trucks.
Whether you’re replacing worn components or tricking out your cab, the right parts make all the difference. Keep your Freightliner M2 Business Class looking great and running strong—mile after mile.

Frequently Asked Questions About Freightliner M2 Business Class Parts

What years and models of Freightliner M2 Business Class trucks do your parts fit?

Our parts are designed to fit Freightliner M2 Business Class trucks from 2003 to present. However, compatibility can vary by specific part type. For bumpers and body panels, there are typically three main design generations: 2003-2007, 2008-2017, and 2018-present. Always check the product description for exact year ranges, or contact our team with your OEM number to ensure proper fitment. Some parts may also fit the M2 106 and M2 112 variants, but verify compatibility before ordering.

Are aftermarket bumpers as durable as OEM parts, and what materials are they made from?

Quality aftermarket bumpers for the M2 Business Class are typically constructed from either heavy-duty steel (16-gauge or thicker) or high-impact ABS plastic, depending on the application. Steel bumpers often feature chrome plating or powder coating for corrosion resistance. While OEM parts meet factory specifications, many aftermarket options actually exceed OEM durability standards, especially those designed for vocational use. Look for bumpers with reinforced mounting brackets and proper drainage holes to prevent rust. We clearly specify material thickness and coating type in each product listing.

What are the most common installation challenges when replacing M2 Business Class bumpers?

The most frequent installation issues include: alignment with existing mounting holes (especially on 2008+ models where hole patterns changed), proper fitment around fog lights and sensors, and weight management during installation (steel bumpers can weigh 80-150 pounds). Many customers report needing to slightly enlarge mounting holes or use washers for proper alignment. We recommend having a second person assist with installation and using a floor jack to support the bumper during mounting. Installation typically takes 2-3 hours with basic tools, though vehicles with air dam systems or integrated step plates may require additional time.

What finish options are available, and which holds up best for different applications?

Common finishes include chrome-plated steel, polished stainless steel, painted steel, and textured plastic. For highway applications, chrome provides the classic look but requires regular maintenance to prevent pitting. Polished stainless steel costs more initially but resists corrosion better in salt-heavy regions. For vocational trucks in construction or waste management, painted steel bumpers with textured powder coating offer the best impact resistance and easy touch-up capability. Plastic bumpers work well for urban delivery trucks where weight savings and minor impact absorption are priorities.

Do I need to order additional hardware or brackets when buying a replacement bumper?

Most replacement bumpers come with new mounting brackets, but rarely include bolts, nuts, or washers. Plan to purchase Grade 8 hardware separately - typically you'll need 8-12 bolts (usually 1/2" or 5/8" diameter) with corresponding lock washers and nuts. Some installations may require bumper-to-frame adapter brackets if switching between bumper styles or upgrading from plastic to steel. Fog light brackets, license plate holders, and step plates are usually sold separately. Check if your existing hardware is reusable, but having new hardware on hand prevents installation delays.


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